CVE-2026-25512
CriticalPublic exploitGroup-Office is vulnerable to RCE due to Command Injection via TNEF Attachment Handler
Published Feb 4, 2026 · Updated Aug 12, 2026 · Also known as GHSA-579w-jvg7-frr4
Key Facts
Patch immediately- CVE-2026-25512 is a critical-severity vulnerability (CVSS 9.4 v4) affecting Group Office (Group-Office), groupoffice.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 3.8% probability of exploitation in the next 30 days.
- Fixed versions are available, including Group Office 6.8.150.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
CVSS v4
9.4
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (30-day exploit likelihood)
3.8%
Higher than 89.9% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-25512 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82, and 26.0.5, there is a remote code execution (RCE) vulnerability in Group-Office. The endpoint email/message/tnefAttachmentFromTempFile directly concatenates the user-controlled parameter tmp_file into an exec() call. By injecting shell metacharacters into tmp_file, an authenticated attacker can execute arbitrary system commands on the server. This issue has been patched in versions 6.8.150, 25.0.82, and 26.0.5.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Group OfficeGroup-Office | See advisory | 6.8.150 |
| groupoffice | >= < 6.8.150 | n/a |
Patched Releases
Group Office
6.8.150
Timeline
Publicly disclosed
Feb 4, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25512.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-25512
- otherhttp://github.com/Intermesh/groupoffice/commit/6c612deca97a6cd2a1bd4feea0ce7e8e9d907792
- otherhttps://github.com/Intermesh/groupoffice/security/advisories/GHSA-579w-jvg7-frr4
FAQ
Common Questions.
Group-Office is an enterprise customer relationship management and groupware tool.
Affected: Group Office (Group-Office); groupoffice versions >= < 6.8.150. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Group Office 6.8.150.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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